Apparatus



May 20, 1952 W|| H|DE Re 23,500

APPARATUS FOR DRESSING VALVE SEAT GRINDING I STONES FOR CONVEX VALVE SEATS Ongmal Flled Oct 3 1946 4 Sheets-Sheet 1 INVENTOR. Gzemamwme ja iic 412;,

G. c. WILHIDE 23,500 APPARATUS FOR DRESSING VALVE SEAT GRINDING STONES FOR CONVEX VALVEUSEATS 0r1g1nal Flled Oct 3, 1946 4 Sheets-Sheet 2 a 9 1 0 2 v. a M

4 4 4 a A I VI M/ V m A Q 7 V a W 5 Z. J w a "7 E 3% May 20,1952 G. c. WILHIDE 23,500

APPARATUS FOR DRESSING VALVE SEAT GRINDING STONES FOR CONVEX VALVE SEATS Original Filed Oct. 5, 1946 4 Sheets-Sheet 3 INVHVTOR. GLENN C. W/Ul/Df ATTONEKS May 20, 1952" 4 Sheets-Sheet 4 ING VALVE SEAT GRINDING STONES FOR CONVEX VALVE SEATS 0r1g1nal Filed Oct 3, 1946 ESS G. C. WILHIDE APPARATUS FOR DR ATTOBMFYJ Reissued May 20, 1952 I R parent from. thefollowing description of a pre- Variation in port ,diametersan'dthe stones v yferred form of the invention, reference .being 30 of a y g r es o abrasive grainrefinement made to theaccompanying drawings wherei n for both roughiand finished cut, although it has Fig. 1 is a perspective view of my apparatus been found that usually an arcuateivalve seat for forming convex valve seats; may be formed withthe desired surface finish Fig. lA 'is a fragmentary sectional View of a by theuse of one stone of proper grainrfineness. convex valve seat formation and a cooperating 35 t is a Well wn p m that t e necessity conventional valve head; for valvereseatingis often caused-by theforma- 'Fig. 2 is'a front elevation of the apparatus tion of deposits onthe valveseat suchasjhardshown-in Fig. land shown here partly in section ened carbon, and carbon and voil pounded-. taken along the ,linezZ-g! of Fig. 3 the valveseat by the actionofthe valving. surface Fig. is an end elevation of the apparatus of the Valve m mber. I have found that ,if a. shown ;in Fig 1 and s hqwn; he11e partly jnge slightly convexvalve seat could ,be formed ina tion taken alongthe-line 3-3 of Fig. 2 practical manner the action of the .coniform Figs. 4, .5 and 6 are descriptive diagrams of surface of the ,valve member upon suchconvex U. N FIT-E D v1S PATEN T 0F F l-C-E 23,500 APPARATUS :EOR EDRESSING VALVE iSEAT- GRINDING STONES FOR OONVEX -,VALVE SEATS Glenn C. Wilhide,Towson,'-Md., assignor -to The Black at-Decker Manufacturing Company, '.lowson, .Md., .a corporation of -Maryland I Original No. 2,582,763, dated January 15, 1952,

Serial No. 101,002, October .3, 1946. Application for. reissue February 19, 1952, Serial No. 272,461

.4 claims (c1.125 1-1) Matter enclosed in heavy brackets :[jl appears in the original ,patent but forms no part ofjthis reissuespecification; matter printedinitaliosindicates the additionszmade byreissue. r

n1obj o o t e pr s t n e tio is thep o with the valve stem'boreor valvestem guideiof siongofanovel wheel dressin fixture for iform- Y the engine blockby inserting a pilot-shaft in the ing concavevalve grindingsurfaces to-grindiconvalve stem-bore of the block which serves as a vex-seats in internalcombustionengines :iwhereprecision .guide for ;the stone. {The upper end by the bevel valving surface ,of. conventional 5 of thepilot-shaftextends above the top-surface valve members will {be more readily seated-and of the'block toaffordaguiding post adapted to whereby the groundconvex surface functions to engage the bore of the arboriof auvalve-seatstone afford a scavenging action in preventing .the or grinding Wheel. The valve seat grinding formationof .carbon and other deposits .:on the Wheel has a beveled-or coniform surfaceformed valveseats of the-engine block. thereon which grinds p-recise1y the valve seat.

Another object of the presentinvention is the Such'wheels orstones are usually mounted upon provision .of a dressing tool for forming precia hollow shaft havinga bore-corresponding vto sion concave grinding surfaces on valve seat the diameter of the-pilot-shaftand thestoneor grinding stones or Wheels whereby a -prac ti cal wheel shaft is constructed inisuch manner asto means-isvafiorded-forforming convex ,valve seats be attached to. or.bedriven bya portable-electric in-internal combustionengine blocks. motor. Thelbevel or. coniformsurfaceis precise- A fur'therobject of the present inventionyis the ly formed-onthe stonevby avdressing tool usually provision. of adressingtool which willfonnconin-the form of a :diamondpointorcutter. The cave grinding surfaces on valve seatvgrinding stone while driven by the motor is' positioned stones, the angles of .the cloevels of which may ona stud shaftvabout twhichithe stone is rotated vary in accordance with the varianceof .prac- While attached .to the portable motor and the tice of valve designers. diamond point .01 the fixture ,is carried vby an A further object is the provision of a stone adjustableslide whichcan be set at the desired dressing tool for the above stated purposesyvhich angle relative .to thestone axis to pre i ly trim may be constructed to remain preciseinoperaorrcutor dress .the p o-beve ed surface of the tion throughout a protracted period oiuse in stone to-conform tothe exact angle of-the .valve an environment of abrasivedust. seat angle to be formed. Stones of various diam- ,Other objects. of the persent invention will b eters are usually available to meet theneed and my method of forming a concave .valve seat surface is such as to prolongthe-periodof per forming surface on .a valve grinding wheel or formanceof the valve-mechanism without necesstone. sitating seating or regrinding, This ,action is .Inthe art. of forming-beveled or coniformyalve such that/each time the valve memberisbrought seats .at the intake and exhaust ports. of an .indown upon the convex seatby the ,actionwof the ternal combustion.enginebloek, it isthepresent valvespringalinering contactismadebetween practice toassure concentricity oflthe .valve seat the .valve member and the .convex valve seat becomes widened over a period of use. In accordance with the present invention I have devised a manner of forming a concave grinding surface on the stone bevel in such a practical, simple manner as to preclude the usual inaccuracies and I have devised a fixture for carrying out the mode of such stone surface formation. The mode and apparatus are utilizable for the formation of such concave surfaces on stone, the valve angle surface of which mayvary in accordance with the variation-and the practice tion engine engineering.

I have found that by mounting the diamond upon a swinging arm the axis of swinging motion of which can be adjusted to conform with variation in the angle of valve seats will cause the diamond point to swing in an arcuate path which interrupts the normal coniform surface of revolution of the stone. The crest of the arc of the point path relative to the normal coniformsurface will be substantially in a normal line bisecting the length of the coniform surface to be treated and produce a slightly concave surface. The extent of this concavity can be increased or decreased. by lengthening or shortening respectively the radius of the swing of the diamond point.

Referring to Fig. l, I disclose such an apparatus wherein the swinging arm It] carries the diamond point H in such an arc. The pivotal axis of the swinging arm may be disposed at various angles as will be later understood. This apparatus comprises a an integral standard or vertical wall l3 upon which the arm I is angularly adjustably mounted as well as swingably mounted as will be described hereinafter. A manually operated rod and knob lob is shown as a means for swinging the arm Ill. The diamond has a holder II which may be adjusted relative to the arm by a nut Ila.

. The base l2 has a slideway formation'for the reception and holding of a slide member l5, there being a gib member it which forms one side of the slideway and also serves as a clamping means for the slide (5. Slide l5 has a pedestal l8 thereon supporting an arbor or fixed stud shaft l9 which may be clamped at any desired heightby reason of the clamping structure of the pedestal comprising tightening screw Illa having a lever arm 20 for that purpose. The slideway with a stone thereon thus is adjustable toward and away from the swinging path of the diamond point depending upon'the diameter of the coniform surface of the stone.

Referring to Figs. 2 and 3, it will be seen that the support or mounting for the swingable arm Ill comprises a member 22 which has a pivotal connection with the upright portion 13 of the base (see Fig. 3). This pivotal connection comprises a stud formation 25 extending into a bore formed in the upright portion l3 of the base having a threaded outer end engaged by a. holding nut 26 which reacts against a spring washer 21. The member 22 has an annular track or slide formation 22a abutting a finished annular surface formed on the upright I3. The centerline or axis of the stud formation 25 extends in a direction at right angles to the slide I5 and: in the present form of the invention is of combus base formation 12 having 34 so that the arm may .to maintain the arm in a 4 co-incident with the plane of swing of the cutter point.

The upright 13 has a protractor segment l3a integrally formed therewith having a graduated surface 30 calibrated in degrees through a sufficient range to include all of the angles of valve surface or slope of known practices. The memher [manner] 22 has an upwardly extending arm 31 formed thereon terminating in a sleeve formation 32 which overhangs the calibrated surface 30 of the protractor segment. Disposed within the sleeve 32 are a clamping bushing 33 and a clamping nut 34 having inner ends thereof beveled to conform with bevels formed adjacent the protractor surface 30. A binding screw or nut 35 is in threaded engagement with the clamping nut be swung about the axis of pivot stud 25 to any desired position along the protractor segment I3a and thus swing the member 22 and the pivotal axis of the cutter carrying arm H] to the selected position. Hence themember 22 is of such shape as to serve as a support for the pivotal mounting'of the arm ill (see Fig. 2). To this end a stud shaft 40 is fixed in a suitable bore formed in the member 22 to have its center line extend in a plane which plane includes the axis of the pivotal structure 25 The stud shaft 49 supports spaced bearing races M which cooperate with races 42 and the bearing balls disposed therebetween to form a precision pivotal connection between the arm 10 and the member 22, the bearing members 42 being fixed in the sleeve formation lUa of the swingable arm in. The outer end of stud shaft 40 is threaded to receive a retaining nut Ma which holds a spacer washer 42a in abutment to one of the inner race members 4 l. The spacer washer 42a is keyed or stud shaft to form an anchor for one end of a spring member 43, the outer end of the spring member being attached to a closure member 44 fixed to the end of the sleeve formation Illa of the swingable arm In so that the spring will tend normally upward position. The sleeve formation Illa is provided with two stop formations 46 and 41 which limit the upward and downward swing of the arm ID by abutting against the finished hub surface 22a of the member 22. I

Itwill be noted in Fig. 2 that the cutting point of the diamond ll (see dot and dash lines) is disposed co-incident with the center line of the pivotal structure 25 and that the axis of the stone stud shaft I9 is disposed vertically on slide 15. Also, it will be'noted that the pivotal axis of the arm l0 may be adjusted to any angle within the limits of the protractor formation I3aby swinging the arm 3| to the desired angle indicat ed by the position of the marginal edge of the sleeve formation 32 along the graduated surface 30.. Such angular displacement of the swingable arm I0 however does not displace the cutting point II in its relation to the axis of the stud formation 25. Hence, regardless of such angular adjustment a swinging movement of the cutting point II will always have a point in its arcuate path which will become substantially co-incident with thecenter line of the arm 3| and such point will always correspond to the lowest point in' the concave surface to be formed relative to the normal beveled surface of be taken on the stone withfixed to the end of the' the grinding or cuttin 7 provided so that j formation C-B'D' 5 out further adjustment of the initial position of the slide 15.

In Figs. 4 and 5, a diagrammatic representation of a stone 19 with a cylindrical surface '50 is shown. The pivotal axis 5| of arm i (point A) is disposedin .a horizontal plane and the axis 52 of stone ll! in a vertical plane. The plane .of arm axis bisects cylindricalsurface 50. Diamond point H at position B is tangent .to cylindrical surface 50 and swinging of the arm wouldeifect no cutting of the stone. As diamond point II is adjusted or fed toward the axis 52 of wheel 49 swinging movement of arm ID will cause the diamond point to disrupt the cylindrical surface 50 and form the concave surface C-BD. It is obvious that decreasing the swinging radius of the diamond point will increase the concavity of the stone surface and increasing the radius will decrease the degree of concavity.

In Fig. 6 the axis A of the arm is swung 45 from the horizontal position shown in Figs. 4 and 5 and a stone with a beveled or 45 coniform surface is shown. Relative feeding movement between the stone and diamond'point and swinging of the point will effect the concave surface The use of the stone in the reseater mechanism hereinbefore referred to will produce the convex valve seat 60 (see Fig. 1A) for the purpose stated.

It will be understood b those skilled in the art that concave surfaces can be formed on the stone which need not be symmetrical relative to the normal beveled surface of the stone. For example the high point of the convex valve seat to be formed may be above or below the median point of the heretofore normal beveled valve seat. This may be brought about by properly determining the initial vertical position on pedestal I 8 or stud (9 of the stone to thereby dispose the beveled surface thereof above or below the point of maximum depth of cut of the swinging diamond point.

The simplest mode and form of the invention has been disclosed herein but it will be apparent that the principles may be adapted to the formation of concave grinding surfaces on other forms of grinding wheels which are utilized for other production purposes.

I claim.

1. A valve seat grinding wheel dresser comprising a base structure having a vertical extension, a member pivotally mounted to said extension with the pivot axis horizontal, said member being adapted to be clamped with respect to said extension in a selected position, a pivot shaft carried by said member with its axis intersecting at right angles the pivot axis of said member, a horizontal slideway on the base, a slide in the slideway, the direction of movement of said slide being at right angles to the direction of the pivot axis of said member, vertical spindle means on the slide for rotatively supporting a grinding wheel, said spindle means being vertically adjustable to determine the wheel height, and an arm carrying a wheel dressing point intermediate its ends and having one end pivotally carried by said pivot shaft with the other end free to be manually swung about said pivot shaft whereby said wheel dressing point may be swung in an arc across the grinding wheel.

2. A valve seat grinding wheel dresser comprising a base structure having a vertical extension, a member pivotally mounted to said extension with the pivot axis horizontal, said member being adapted to be'clamp'ed with respect to said extension [etxension] in a selected position, a pivot shaft carried by said member with its .axis intersecting at right angles the pivot axis of said member, ahorizontal slideway on the base, a slide in the slideway, the direction of movement vof said slide being at right angles to the direction of the pivot axis of said member,lverticalspindle means on the slidefor rotatively supporting a grinding wheel, .said .spindle zmeans being vertically adjustable to determine the wheel height, an arm carrying a wheel dressing point intermediate its ends'and having one end pivotally carried by said pivot shaft with the other end free to be manually swung about said pivot shaft whereby said wheel dressing point may be swung in an arc across the grinding wheel, and torsion spring means linking the arm and shaft to return the arm to horizontalv position after manual release.

3. A valve seat grinding wheel dresser comprising a base structure having a vertical extension, a member pivotally mounted to said extension with the pivot axis horizontal, said member being adapted to be clamped with respect to said extension in a selected position, a pivot shaft carried by said member with its axis intersecting at right angles the pivot axis of said member, a horizontal slideway on the base, a slide in the slideway, the direction of movement of said slide being at right angles to the direction of the pivot axis of said member, vertical spindle means on the slide for rotatively supporting a grinding wheel, said spindle means being vertically adjustable to determine the wheel height, and an arm carrying a wheel dressing point intermediate its ends and having one end pivotally carried by said pivot shaft with the other end free to be manually swung about said pivot shaft whereby said wheel dressing point may be swung in an arc across the grinding wheel, said arm being provided with precision rolling bearing means enclosed within its pivot end for said pivot shaft.

4. A valve seat grinding wheel dresser comprising a base structure having a vertical extension, a member pivotally mounted to said extension with the pivot axis horizontal, said member being adapted to be clamped with respect to said extension in a selected position, a pivot shaft carried by said member with its axis intersecting at right angles the pivot axis of said member, a horizontal slideway on the base, a slide in the slideway, the direction of movement of said slide being at right angles to the direction of the pivot axis of said member, vertical spindle means on the slide for rotatively supporting a grinding Wheel, said spindle means being vertically adjustable to determine the wheel height, an arm carrying a wheel dressing point intermediate its ends and having one end pivotally carried by said pivot shaft with the other end free to be manually swung about said pivot shaft whereby said wheel dressing point may be swung in an arc across the grinding wheel, said arm being provided with precision rolling bearing means enclosed Within its pivot end for said pivot shaft, and torsion spring means linking the arm and [end] shaft to return the arm to horizontal position after manual release.

GLENN c. WILHIDE.

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